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Signature	Maker	Instruments	Comments	Location	References
LADD, WILLIAM	England, fl.1847-69, OIM PHIM	Microscopes = D., Phillips 2/22/77, Karolinska Institutet, Sweden.	made barometers and thermometers; optician; devised a method for coarse focusing on a microscope; had a display in the 1851 Great Exhibition in London.	7 Cleaver Street, Kennington (1847); 31 Chancery Lane (1858); 11 and 12 Beak Street, Regent Street W. (1869); 29 Penton Street, Walworth Road; all in London.	Goodison 1; O'Mara; Fürst; Moskowitz; G.L'E. Turner 24; RSW.
LADD, WILLIAM	England, fl.1847-69, OIM PHIM	Microscopes = D., Phillips 2/22/77, Karolinska Institutet, Sweden.	made barometers and thermometers; optician; devised a method for coarse focusing on a microscope; had a display in the 1851 Great Exhibition in London.	7 Cleaver Street, Kennington (1847); 31 Chancery Lane (1858); 11 and 12 Beak Street, Regent Street W. (1869); 29 Penton Street, Walworth Road; all in London.	Goodison 1; O'Mara; Fürst; Moskowitz; G.L'E. Turner 24; RSW.

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